Quantum and Classical Orientational Ordering in Solid Hydrogen

Abstract

We present a unified view of orientational ordering in phases I, II, and III of solid hydrogen. Phases II and III are orientationally ordered, while the ordering objects in phase II are angular momenta of rotating molecules, and in phase III the molecules themselves. This concept provides quantitative explanation of the vibron softening, libron and roton spectra, and increase of the IR vibron oscillator strength in phase III. The temperature dependence of the effective charge parallels the frequency shifts of the IR and Raman vibrons. All three quantities are linear in the order parameter.

Replaced with the final text, accepted for publication in PRL. 1 Fig. added. Misc. text revisions

References in corpus (1)

• Insulator-metal transition in solid hydrogen: Implication of electronic structure calculations for recent experiments

Cited by in corpus (21)

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• Bonding, structures, and band gap closure of hydrogen at high pressures
• Hexagonal structure of phase III of solid hydrogen
• Quantum Monte Carlo Study of High Pressure Solid Molecular Hydrogen
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• Strong Isotopic Effect in Phase II of Dense Solid Hydrogen and Deuterium
• Classical and quantum ordering of protons in cold solid hydrogen under megabar pressures
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• Anhamonic finite temperature effects on the Raman and Infrared spectra to determine the crystal structure phase III of solid molecular hydrogen
• Wannier-function description of the electronic polarization and infrared absorption of high-pressure hydrogen
• Polarization and Strong Infra-Red Activity in Compressed Solid Hydrogen
• Theoretical evidence for a reentrant phase diagram in {\em ortho-para} mixtures of solid H${}_2$
• Intermolecular coupling and fluxional behavior of hydrogen in phase IV
• Nuclear Spin Crossover in Dense Molecular Hydrogen
• Structural Phase Transition at High Temperatures in Solid Molecular Hydrogen and Deuterium
• Sound velocities of hexagonal close-packed H2 and He under pressure
• High-pressure II-III phase transition in solid hydrogen: Insights from state-of-the-art ab initio calculations
• Experimental phase transition mapping for hydrogen above 300 K up to 300 GPa